Kreg Crown-Pro NK7825 Guide D'utilisation page 9

Example "A"
Use the Angle Finder to calculate the
4
necessary saw angle
Before each corner cut you make, it's important to find
the angle of the wall before setting your saw. Often times
your corner angle will be off by a few degrees, resulting
in a gap between the molding if you don't properly
compensate with your saw. In this example, the corner
turned out to be 88°, or 2° short of 90°.
If you have a Miter Saw which reads 90° at the front,
you'll simply divide the wall angle (88°) by 2, to get a
saw angle of 44°.
If you have a Miter Saw which reads 0° at the front (the
majority of miter saws), you'll need to divide the "Spring
Angle" by 2 instead of the "Wall Angle". In our example,
the "Spring Angle" is 92°, and divided by 2, will get your
saw angle at 46°.
88° ÷ 2 = 44°
92°
90°
(See Example A)
(See Example B)
Step-by-Step
L
88°
Example "B"
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0°